CN108658222B - Rural sewage treatment process in hilly and mountainous areas based on gravitational potential energy oxygenation tank - Google Patents
Rural sewage treatment process in hilly and mountainous areas based on gravitational potential energy oxygenation tank Download PDFInfo
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- CN108658222B CN108658222B CN201810770247.XA CN201810770247A CN108658222B CN 108658222 B CN108658222 B CN 108658222B CN 201810770247 A CN201810770247 A CN 201810770247A CN 108658222 B CN108658222 B CN 108658222B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/24—Activated sludge processes using free-fall aeration or spraying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
A rural sewage treatment process in hilly and mountainous areas based on a gravitational potential energy oxygenation tank comprises the following steps: (1) acidifying and hydrolyzing pretreatment, namely converting macromolecular substances which are difficult to biodegrade into micromolecular substances which are easy to biodegrade, and improving the biodegradability of sewage; (2) adopting a gravitational potential energy oxygenating tank, and enabling the pretreated sewage to enter the oxygenating tank by utilizing the gravitational potential energy to oxygenate the system effectively; so that the sewage can achieve full aerobic biological treatment in the oxygenation tank system; (3) the siphon type composite subsurface flow constructed wetland is adopted to treat sewage efficiently by an ecological-biological method; by utilizing the siphon action, the sludge deposited on the bottom layer of the wetland is timely and continuously siphoned and discharged, so that the silted sludge generated in the sewage treatment process can not be accumulated and solidified in the wetland for a long time, the silting and blocking problems of the wetland are effectively solved, and the long-acting stable operation of sewage treatment is realized.
Description
Technical Field
The invention relates to a rural sewage treatment process in hilly and mountainous areas based on a gravitational potential energy oxygenation tank, belonging to the technical field of sewage treatment.
Background
Water pollution causes deterioration of water environment, and directly influences production and life of people. Research and development of sewage treatment technologies and processes are in constant progress. The sewage treatment process has been developed in large scale and widely used, and physical, chemical, biological or a combination of various processes are generally adopted according to different types and properties of sewage. With the continuous improvement and development of sewage treatment processes or technologies, the limitations of the traditional biological method, ecological method and other technologies are highlighted in time or space.
The traditional aerobic biotechnology is that the pressure fan provides air quantity which is dozens of times of water quantity to supply oxygen for aerobic microorganisms, so that a large amount of power is consumed, and higher construction cost and operation cost are required.
In hilly and mountainous areas, the process of flowing through the rural sewage has obvious height difference (h), the favorable topographic advantages are fully utilized, and the aerobic activated sludge is oxygenated by utilizing the gravitational potential energy, so that the aerobic treatment of the sewage is realized.
The artificial wetland can efficiently remove sewage pollutants and has an economic operation mode, so that the artificial wetland can be widely applied. Compared with other sewage treatment processes, the artificial wetland has many advantages in sewage treatment: stable water outlet, low construction and operation cost, simple maintenance, high treatment efficiency, wide application range and strong application capability to load change.
Certain problems are found in the research and application of the artificial wetland. Such as clogging problems. The blockage is a great problem which hinders the long-term operation of the constructed wetland and seriously influences the sewage purification effect. The accumulated pollutants block the pores of the matrix, so that the hydraulic conductivity coefficient is reduced, oxygen in the matrix is restored and slowed down, the physical and chemical environment is deteriorated, the microbial activity is reduced, and finally the pollutant degradation rate is further slowed down.
In the operation process of the surface flow, subsurface flow or vertical subsurface flow artificial wetland, the wetland treatment system has the problem of insufficient reoxygenation capacity, so that the organic load is greatly increased, and the long-term operation of the wetland system is seriously influenced.
The siphon type composite subsurface flow constructed wetland is technically innovated and designed and improved in an operation mode, so that the reoxygenation capacity of the wetland sewage treatment system is greatly improved, and the blocking risk of the wetland sewage treatment system is greatly reduced.
The rural sewage treatment process in hilly and mountainous areas is mainly innovated and improved around the aspects of treatment technology, engineering process and the like, effectively solves the problems of high energy consumption, easy blockage of artificial wetland, insufficient reoxygenation capability and the like in aerobic biological treatment, and organically unifies the aerobic sewage treatment technology and the ecological deep treatment technology.
Disclosure of Invention
The invention aims to solve the problem of rural sewage treatment in hilly and mountainous areas, and provides a rural sewage treatment process in hilly and mountainous areas based on a gravitational potential energy oxygenation tank.
The technical scheme is that the rural sewage treatment process in hilly and mountainous areas comprises acidification and hydrolysis pretreatment and aerobic siphon type composite subsurface flow constructed wetland treatment, wherein the aerobic sludge in an oxygenation tank is oxygenated by fully utilizing the gravitational potential energy in the sewage treatment process, so that the sewage is subjected to high-efficiency aerobic treatment; the siphon effect of the siphon type composite vertical subsurface flow constructed wetland is utilized, the aerobic treatment effect of the sewage is enhanced, a biological method and an ecological method are organically integrated in the sewage treatment, the sedimentation and blockage problems of the wetland are effectively solved, and the blockage risk of the wetland is greatly reduced.
A rural sewage treatment process in hilly and mountainous areas based on a gravitational potential energy oxygenation tank comprises the following specific steps:
(1) acidifying and hydrolyzing for pretreatment, converting the macromolecular substances difficult to biodegrade into the micromolecular substances easy to biodegrade, and improving the biodegradability of the sewage.
(2) Adopting a gravitational potential energy oxygenating tank, and enabling the pretreated sewage to enter the oxygenating tank by utilizing the gravitational potential energy to oxygenate the system effectively; so that the sewage can be fully treated by aerobic organisms in the oxygenation tank system.
(3) The siphon type composite subsurface flow constructed wetland is utilized, and an ecological-biological method is adopted to efficiently treat sewage; by utilizing the siphoning effect, the sludge deposited on the bottom layer of the wetland is discharged in time and continuously in a siphoning manner, so that the deposited sludge generated in the sewage treatment process can not be accumulated and solidified in the wetland for a long time, the problem of wetland deposition and blockage is effectively solved, and the long-acting stable operation of sewage treatment is realized; by utilizing the tide principle, the sewage level fluctuates in the wetland repeatedly, air continuously enters and exits the wetland along with the fluctuation of the sewage level, the dissolved oxygen content in the sewage is increased, the respiration of aerobic microorganisms attached to the substrate is enhanced, and the effect of aerobic treatment of the sewage is achieved.
The gravitational potential energy oxygenating tank is divided into a first aerobic tank, a middle tank and a second aerobic tank from top to bottom; the first aerobic tank is connected with the middle tank through a first siphon pipe; the middle tank is connected with the second aerobic tank through a second siphon pipe; a water outlet is arranged at the upper part of the second aerobic tank, and a sludge discharge port is arranged at the lower part of the second aerobic tank; an air duct vertical to the horizontal plane is arranged between the middle tank and the second aerobic tank, the upper part of the air duct is close to the top of the middle tank, and the lower part of the air duct is close to the bottom of the second aerobic tank; rural sewage to be treated enters a first aerobic tank from the upper part; the sewage treated by the first aerobic tank enters the intermediate tank through a first siphon pipe; the sewage entering the intermediate tank presses the air in the intermediate tank into the second aerobic tank at the same time, and the second aerobic tank is oxygenated; the water level of the middle tank reaches a certain height, and the wastewater in the tank enters a second aerobic tank through a second siphon pipe; the effluent of the wastewater treated by the second aerobic tank is discharged from the water outlet, and the sludge is discharged from the sludge discharge port.
The sewage after acidification and hydrolysis pretreatment is subjected to aerobic treatment under the action of aerobic microorganisms in the activated sludge in the first aerobic tank; the middle tank is an exchange tank of sewage and air, and the sewage in the second aerobic tank is intermittently and regularly oxygenated through the air guide pipe; and the second aerobic tank continuously carries out aerobic treatment on the sewage.
The volume ratio of the first aerobic tank to the intermediate tank to the second aerobic tank is 2:1: 1.
The highest end of the first siphon is slightly lower than the height of the highest effective water level of the oxygenation tank, and the siphon opening is positioned at the 1/2 depth of the first aerobic tank; the lowest end of the first siphon is located at the 1/2 depth of the intermediate tank.
The highest end of the second siphon is slightly lower than the top end of the middle tank, and the siphon port is positioned at the 1/2 depth of the middle tank; the lowest end of the second siphon is slightly higher than the bottom end of the second aerobic tank.
The highest end of the air duct is slightly lower than the top end of the middle tank, and the lowest end of the air duct is slightly higher than the bottom end of the second aerobic tank.
The water outlet is positioned at the position which is positioned at the outer side of the second aerobic tank and is higher than the upper end 1/5; the sludge discharge port is positioned at the position which is at the outer side of the second aerobic tank and is far from the bottom end 1/5.
The siphon type composite subsurface flow constructed wetland carries out biological and ecological combined treatment on the sewage which is subjected to aerobic treatment by the gravitational potential energy oxygenation tank.
The siphon type composite subsurface flow constructed wetland is divided into an ascending pool and a descending pool; the drainage of the ascending pool adopts siphon drainage pipes for drainage, and the siphon drainage pipes are equidistantly distributed on the right outer side of the ascending pool; the ascending pool and the descending pool have 1/4 height difference; the 1/2 matrix part of the first matrix layer in the descending pool is always in the air; 3 layers of matrixes are respectively paved in the descending pond and the ascending pond, the first matrix layer matrix from top to bottom is biological ceramsite with small particle size, the second matrix layer matrix is zeolite with large particle size, and the third matrix layer matrix is cobblestone with large particle size; the first substrate layer and the second substrate layer of the descending pool and the ascending pool are separated by obstruction; the third substrate layers of the descending pool and the ascending pool are integrally communicated; the sewage in the descending pool flows to the ascending pool through the communicating port; plants are planted on the surface layer of the descending pool, and water distribution pipes are uniformly arranged below the plants.
In the siphon drainage process of the siphon composite subsurface flow constructed wetland, one part of the substrate layer is always in the air, and aerobic microorganisms are attached to the substrate to carry out aerobic treatment on sewage; the other part of the substrate layer is in an anoxic state, and the substrate is attached with microorganisms to carry out facultative or anaerobic treatment on the sewage; different matrixes absorb and remove the sewage pollutants, and surface plants absorb and remove the sewage pollutants.
The invention has the advantages that in the sewage treatment process, the aerobic sludge in the oxygenation tank is oxygenated by fully utilizing the gravitational potential energy, so that the sewage is subjected to high-efficiency aerobic treatment; the siphon effect of the siphon type composite vertical subsurface flow constructed wetland is fully utilized, the aerobic treatment effect of the sewage is enhanced, a biological method and an ecological method are organically integrated in the sewage treatment, the sedimentation and blockage problems of the wetland are effectively solved, and the blockage risk of the wetland is greatly reduced. The invention is suitable for local conditions, biological ecology, low carbon, energy saving and long-acting operation. The quality of the effluent treated by the process can stably reach the standard of discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002).
Drawings
FIG. 1 is a process flow of rural sewage treatment in hilly and mountainous areas;
FIG. 2 is a schematic view of a gravitational potential energy oxygenating tank;
FIG. 3 is a schematic structural view of a siphon-type composite vertical subsurface flow constructed wetland;
in the figure, 1 is a first aerobic tank; 2 is an intermediate tank; 3 is a second aerobic tank; 4 is water flow; 5 is a first siphon; 6 is a second siphon; 7 is an airway tube; 8 is a water discharge port; 9 is a sludge discharge port; 11 is a plant; 12 is a first matrix layer; 13 is a second matrix layer; 14 is a third matrix layer; 15 is a downlink pool; 16 is a communication port of the descending pool and the ascending pool; 17 is an ascending pool; 18 is a siphon drain.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The rural sewage treatment process in the hilly and mountainous areas based on the gravitational potential energy oxygenation tank comprises the following steps:
(1) acidifying and hydrolyzing for pretreatment, converting the macromolecular substances difficult to biodegrade into the micromolecular substances easy to biodegrade, and improving the biodegradability of the sewage.
(2) Adopting a gravitational potential energy oxygenating tank, and enabling the pretreated sewage to enter the oxygenating tank by utilizing the gravitational potential energy to oxygenate the system effectively; so that the sewage can be fully treated by aerobic organisms in the oxygenation tank system.
(3) The siphon type composite subsurface flow constructed wetland organically unifies and efficiently treats sewage by an ecological-biological method; by utilizing the siphon action, the sludge deposited on the bottom layer of the wetland is timely and continuously siphoned and discharged, so that the silted sludge generated in the sewage treatment process can not be accumulated and solidified in the wetland for a long time, the silting and blocking problems of the wetland are effectively solved, and the long-acting stable operation of sewage treatment is realized.
As shown in figure 1, the whole sewage treatment process in rural sewage treatment in hilly and mountainous areas based on the gravitational potential energy oxygenation tank can show that in the embodiment, after pretreatment of early acidification and hydrolysis, sewage macromolecular organic matters are converted into micromolecular organic matters, and the sewage bioactivity is improved.
As shown in figure 2, the sewage after acidification and hydrolysis enters a gravitational potential energy oxygenation tank. Sewage flow 4 with high gravitational potential energy enters the first aerobic tank 1 at high speed, efficient oxygenation is carried out, and aerobic treatment is carried out on the sewage under the action of aerobic microorganisms in the activated sludge; then, when the sewage in the first aerobic tank reaches a certain water level, the sewage enters the intermediate tank 2 through the first siphon 5; because the middle tank 2 is a closed structure, along with the continuous entering of sewage, under the action of water pressure, air in the middle tank 2 enters the second aerobic tank 3 through the air ducts 7 which are uniformly distributed, and the sewage in the second aerobic tank is intermittently and regularly oxygenated. Meanwhile, after the sewage in the middle tank 2 reaches a certain water level, the sewage enters the second aerobic tank 3 through the siphon pipes 6 which are uniformly distributed; after being treated by the second aerobic tank 3, the sewage is discharged into the siphon-type composite subsurface flow constructed wetland through the water outlet 8 for further treatment.
As shown in figure 3, the sewage enters the siphon type composite subsurface flow constructed wetland after being treated by the gravitational potential energy oxygenating tank. Sewage enters the wetland through the water distribution pipe below the plant layer 11 of the descending pond 15; the plants 11 planted on the surface of the descending pool 15 absorb and degrade the pollutants in the sewage. Plants absorb pollutants such as nitrogen, phosphorus and the like in sewage, grow and breed, and are mowed when growing to a certain degree; then, sewage flows to the first matrix layer 12 and the second matrix layer 13 through the plants 11 on the surface of the descending tank 15, and enters the ascending tank 17 through the communication port 16 of the third matrix layer 14; the sewage is further treated in the ascending tank 7 through the second matrix layer 13 and the first matrix layer 12 in sequence; when the water level of the water body in the ascending pool 17 reaches the root system of the plant 11 on the surface, the plant further absorbs the pollutants such as nitrogen, phosphorus and the like in the sewage. The sewage after a series of treatments is discharged out of the wetland through a siphon-type drain pipe 18. And the sludge deposited on the bottom layer of the wetland is discharged along with the treated sewage through a siphon.
The quality of the effluent water treated by the system of the embodiment can stably reach the standard of discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002).
Claims (3)
1. A rural sewage treatment process of hilly and mountainous areas based on a gravitational potential energy oxygenation tank comprises acidification hydrolysis pretreatment and aerobic siphon type composite subsurface flow constructed wetland treatment, and is characterized in that in the sewage treatment process, the aerobic sludge in the oxygenation tank is oxygenated by fully utilizing the gravitational potential energy, so that the sewage is subjected to high-efficiency aerobic treatment; the siphon effect of the siphon type composite vertical subsurface flow constructed wetland is fully utilized, the aerobic treatment effect of the sewage is enhanced, a biological method and an ecological method are organically integrated in the sewage treatment, the sedimentation and blockage problems of the wetland are effectively solved, and the blockage risk of the wetland is greatly reduced; the method comprises the following specific steps:
(1) acidifying and hydrolyzing pretreatment, namely converting macromolecular substances which are difficult to biodegrade into micromolecular substances which are easy to biodegrade, and improving the biodegradability of sewage;
(2) adopting a gravitational potential energy oxygenating tank, and enabling the pretreated sewage to enter the oxygenating tank by utilizing the gravitational potential energy to oxygenate the system effectively; so that the sewage can achieve full aerobic biological treatment in the oxygenation tank system;
(3) the siphon type composite subsurface flow constructed wetland is utilized, and an ecological-biological method is adopted to efficiently treat sewage; by utilizing the siphoning effect, the sludge deposited on the bottom layer of the wetland is discharged in time and continuously in a siphoning manner, so that the deposited sludge generated in the sewage treatment process can not be accumulated and solidified in the wetland for a long time, the problem of wetland deposition and blockage is effectively solved, and the long-acting stable operation of sewage treatment is realized; by utilizing the tide principle, the sewage level fluctuates in the wetland repeatedly, air continuously enters and exits the wetland along with the fluctuation of the sewage level, the dissolved oxygen content in the sewage is increased, the respiration of aerobic microorganisms attached to the substrate is enhanced, and the sewage aerobic treatment effect is achieved;
the gravitational potential energy oxygenating tank is divided into a first aerobic tank, a middle tank and a second aerobic tank from top to bottom; the first aerobic tank is connected with the middle tank through a first siphon pipe; the middle tank is connected with the second aerobic tank through a second siphon pipe; a water outlet is arranged at the upper part of the second aerobic tank, and a sludge discharge port is arranged at the lower part of the second aerobic tank; an air duct vertical to the horizontal plane is arranged between the middle tank and the second aerobic tank, the upper part of the air duct is close to the top of the middle tank, and the lower part of the air duct is close to the bottom of the second aerobic tank; rural sewage to be treated enters a first aerobic tank from the upper part; the sewage treated by the first aerobic tank enters the intermediate tank through a first siphon pipe; the sewage entering the intermediate tank presses the air in the intermediate tank into the second aerobic tank at the same time, and the second aerobic tank is oxygenated; the water level of the middle tank reaches a certain height, and the wastewater in the tank enters a second aerobic tank through a second siphon pipe; the effluent of the wastewater treated by the second aerobic tank is discharged from a water outlet, and sludge is discharged from a sludge discharge port;
the sewage after acidification and hydrolysis pretreatment is subjected to aerobic treatment under the action of aerobic microorganisms in the activated sludge in the first aerobic tank; the middle tank is an exchange tank of sewage and air, and the sewage in the second aerobic tank is intermittently and regularly oxygenated through the air guide pipe; the second aerobic tank continuously carries out aerobic treatment on the sewage;
the volume ratio of the first aerobic tank to the intermediate tank to the second aerobic tank is 2:1: 1; the highest end of the first siphon is slightly lower than the height of the highest effective water level of the oxygenation tank, and the siphon opening is positioned at the 1/2 depth of the first aerobic tank; the lowest end of the first siphon is located at the 1/2 depth of the intermediate tank; the highest end of the second siphon is slightly lower than the top end of the middle tank, and the siphon port is positioned at the 1/2 depth of the middle tank; the lowest end of the second siphon is slightly higher than the bottom end of the second aerobic tank; the highest end of the gas guide pipe is slightly lower than the top end of the middle tank, and the lowest end of the gas guide pipe is slightly higher than the bottom end of the second aerobic tank; the water outlet is positioned at the position which is positioned at the outer side of the second aerobic tank and is higher than the upper end 1/5; the sludge discharge port is positioned at the position which is at the outer side of the second aerobic tank and is away from the bottom end 1/5.
2. The rural sewage treatment process in hilly and mountainous areas based on the gravitational potential energy oxygenation tank is characterized in that the siphonic composite subsurface flow constructed wetland carries out biological and ecological combined treatment on sewage subjected to aerobic treatment in the gravitational potential energy oxygenation tank;
the siphon type composite subsurface flow constructed wetland is divided into an ascending pool and a descending pool; the drainage of the ascending pool adopts siphon drainage pipes for drainage, and the siphon drainage pipes are equidistantly distributed on the right outer side of the ascending pool; the ascending pool and the descending pool have 1/4 height difference; the 1/2 matrix part of the first matrix layer in the descending pool is always in the air; 3 layers of matrixes are respectively paved in the descending pond and the ascending pond, the first matrix layer matrix from top to bottom is biological ceramsite with small particle size, the second matrix layer matrix is zeolite with large particle size, and the third matrix layer matrix is cobblestone with large particle size; the first substrate layer and the second substrate layer of the descending pool and the ascending pool are separated by obstruction; the third substrate layers of the descending pool and the ascending pool are integrally communicated; the sewage in the descending pool flows to the ascending pool through the communicating port; plants are planted on the surface layer of the descending pool, and water distribution pipes are uniformly arranged below the plants.
3. The rural sewage treatment process in hilly and mountainous areas based on the gravitational potential energy oxygenation tank is characterized in that in the siphon drainage process of the siphon type composite subsurface flow constructed wetland, one part of a substrate layer is always in the air, and aerobic microorganisms are attached to the substrate to carry out aerobic treatment on the sewage; the other part of the substrate layer is in an anoxic state, and the substrate is attached with microorganisms to carry out facultative or anaerobic treatment on the sewage; different matrixes absorb and remove the sewage pollutants, and surface plants absorb and remove the sewage pollutants.
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|---|---|---|---|---|
| CN101671092A (en) * | 2009-10-12 | 2010-03-17 | 中国农业大学 | Sewage treatment system and method for combined tidal flow artificial wetland |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
| CN105693048A (en) * | 2016-04-29 | 2016-06-22 | 合肥市科柏盛环保科技有限公司 | Unpowered aeration and purification composite medium wetland system for rural domestic sewage |
| CN106006983A (en) * | 2016-07-07 | 2016-10-12 | 凯天环保科技股份有限公司 | Hydrocone type unpowered constructed wetland and reoxygenation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671092A (en) * | 2009-10-12 | 2010-03-17 | 中国农业大学 | Sewage treatment system and method for combined tidal flow artificial wetland |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
| CN105693048A (en) * | 2016-04-29 | 2016-06-22 | 合肥市科柏盛环保科技有限公司 | Unpowered aeration and purification composite medium wetland system for rural domestic sewage |
| CN106006983A (en) * | 2016-07-07 | 2016-10-12 | 凯天环保科技股份有限公司 | Hydrocone type unpowered constructed wetland and reoxygenation method thereof |
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